A sleek, fast-paced BBC hit focusing on domestic-security intelligence agents, dealing with threats that range from arms merchants to germ warfare. The series had a cast overhaul in its third season, with three lead agents replaced by husband-and-wife operatives who came from MI-6.

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Season 10, Episode 4 MI-5

First Aired: October 9, 2011

The team works to stop a suicide-bomb plot by two released prisoners, one of whom is an MI-5 asset. Elsewhere, Harry comes across additional evidence indicating CIA involvement in the assassination attempt on the Russian official; an attempt is made on Elena's life.